fix(docs): target installer venv in voice extra install command

[liuhao1024]

What does this PR do?

Fixes the voice-mode extra install command in the quickstart docs to target the installer-created virtual environment explicitly, preventing failures on fresh curl-installed setups where no venv is active.

Related Issue

Fixes #44364

Type of Change

• 📝 Documentation update

Changes Made

• website/docs/getting-started/quickstart.md: Changed uv pip install -e ".[voice]" to uv pip install --python ./venv/bin/python -e ".[voice]" so it targets the installer-created venv without requiring manual activation.
• website/i18n/zh-Hans/docusaurus-plugin-content-docs/current/getting-started/quickstart.md: Same fix for the Chinese localization.

How to Test

1. On a fresh system (or simulate by deactivating any venv), cd ~/.hermes/hermes-agent
2. Run uv pip install --python ./venv/bin/python -e ".[voice]" — it should install successfully
3. Verify faster-whisper, sounddevice, and numpy are installed in the venv: ./venv/bin/python -c "import faster_whisper; print('OK')"

Checklist

Code

• I've read the Contributing Guide
• My commit messages follow Conventional Commits (fix(scope):, feat(scope):, etc.)
• I searched for existing PRs to make sure this isn't a duplicate
• My PR contains only changes related to this fix/feature (no unrelated commits)
• I've run pytest tests/ -q and all tests pass
• I've added tests for my changes (N/A — documentation only)
• I've tested on my platform: macOS

Documentation & Housekeeping

• I've updated relevant documentation (README, docs/, docstrings)
• I've updated cli-config.yaml.example if I added/changed config keys — N/A
• I've updated CONTRIBUTING.md or AGENTS.md if I changed architecture or workflows — N/A
• I've considered cross-platform impact (Windows, macOS) per the compatibility guide — N/A (docs-only)
• I've updated tool descriptions/schemas if I changed tool behavior — N/A

Code Intelligence

• Analyzed: website/docs/getting-started/quickstart.md (voice-mode section, line 267-275)
• Blast radius: LOW — documentation-only change, no code behavior affected
• Related patterns: The same uv pip install without --python pattern exists in MCP and ACP sections of the same file, but those are out of scope for this issue

[tonydwb]

Code Review Summary

Verdict: Approved

Summary

Fixes the voice extra install command to target the installer venv instead of the runtime venv.

Review

• Correct path fix for the voice extra installation instructions.
• No security concerns.

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Reviewed by Hermes Agent (batch cron)

[teknium1]

Merged into main via consolidated salvage PR #73520 (merge e04c2a9ebd). Your docs fix targeting the installer venv for the voice extra was cherry-picked with your authorship.

Your contribution is credited to you in git history. Thank you! Closing this PR as merged-via-salvage.